diff --git a/package-lock.json b/package-lock.json
index 6749628..3cb2dc1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1031,6 +1031,16 @@
             "color-convert": "^2.0.1"
           }
         },
+        "broccoli-merge-trees": {
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+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
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+          "dev": true,
+          "requires": {
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+            "merge-trees": "^2.0.0"
+          }
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         "chalk": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/chalk/-/chalk-3.0.0.tgz",
@@ -3621,6 +3631,15 @@
         "workerpool": "^3.1.1"
       },
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+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
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+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        },
         "rsvp": {
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           "resolved": "https://registry.npmjs.org/rsvp/-/rsvp-4.8.5.tgz",
@@ -3864,12 +3883,28 @@
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-      "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
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+      "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-4.1.0.tgz",
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       "requires": {
-        "broccoli-plugin": "^1.3.0",
+        "broccoli-plugin": "^3.1.0",
         "merge-trees": "^2.0.0"
+      },
+      "dependencies": {
+        "broccoli-plugin": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-3.1.0.tgz",
+          "integrity": "sha512-7w7FP8WJYjLvb0eaw27LO678TGGaom++49O1VYIuzjhXjK5kn2+AMlDm7CaUFw4F7CLGoVQeZ84d8gICMJa4lA==",
+          "requires": {
+            "broccoli-node-api": "^1.6.0",
+            "broccoli-output-wrapper": "^2.0.0",
+            "fs-merger": "^3.0.1",
+            "promise-map-series": "^0.2.1",
+            "quick-temp": "^0.1.3",
+            "rimraf": "^2.3.4",
+            "symlink-or-copy": "^1.1.8"
+          }
+        }
       }
     },
     "broccoli-middleware": {
@@ -3943,20 +3978,17 @@
     "broccoli-node-api": {
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       "resolved": "https://registry.npmjs.org/broccoli-node-api/-/broccoli-node-api-1.7.0.tgz",
-      "integrity": "sha512-QIqLSVJWJUVOhclmkmypJJH9u9s/aWH4+FH6Q6Ju5l+Io4dtwqdPUNmDfw40o6sxhbZHhqGujDJuHTML1wG8Yw==",
-      "dev": true
+      "integrity": "sha512-QIqLSVJWJUVOhclmkmypJJH9u9s/aWH4+FH6Q6Ju5l+Io4dtwqdPUNmDfw40o6sxhbZHhqGujDJuHTML1wG8Yw=="
     },
     "broccoli-node-info": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/broccoli-node-info/-/broccoli-node-info-2.1.0.tgz",
-      "integrity": "sha512-l6qDuboJThHfRVVWQVaTs++bFdrFTP0gJXgsWenczc1PavRVUmL1Eyb2swTAXXMpDOnr2zhNOBLx4w9AxkqbPQ==",
-      "dev": true
+      "integrity": "sha512-l6qDuboJThHfRVVWQVaTs++bFdrFTP0gJXgsWenczc1PavRVUmL1Eyb2swTAXXMpDOnr2zhNOBLx4w9AxkqbPQ=="
     },
     "broccoli-output-wrapper": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-2.0.0.tgz",
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-      "dev": true,
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         "heimdalljs-logger": "^0.1.10"
       }
@@ -4113,6 +4145,30 @@
         "walk-sync": "^1.1.3"
       },
       "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          },
+          "dependencies": {
+            "broccoli-plugin": {
+              "version": "1.3.1",
+              "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-1.3.1.tgz",
+              "integrity": "sha512-DW8XASZkmorp+q7J4EeDEZz+LoyKLAd2XZULXyD9l4m9/hAKV3vjHmB1kiUshcWAYMgTP1m2i4NnqCE/23h6AQ==",
+              "dev": true,
+              "requires": {
+                "promise-map-series": "^0.2.1",
+                "quick-temp": "^0.1.3",
+                "rimraf": "^2.3.4",
+                "symlink-or-copy": "^1.1.8"
+              }
+            }
+          }
+        },
         "broccoli-plugin": {
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-2.1.0.tgz",
@@ -6122,6 +6178,16 @@
         "yam": "^1.0.0"
       },
       "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        },
         "broccoli-source": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/broccoli-source/-/broccoli-source-3.0.0.tgz",
@@ -7012,6 +7078,18 @@
         "ember-cli-babel": "^7.13.2",
         "ember-cli-typescript": "^3.1.3",
         "ember-inflector": "^3.0.1"
+      },
+      "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        }
       }
     },
     "ember-disable-prototype-extensions": {
@@ -7270,6 +7348,18 @@
         "ember-cli-babel": "^7.12.0",
         "ember-cli-test-loader": "^2.2.0",
         "qunit": "^2.9.3"
+      },
+      "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        }
       }
     },
     "ember-resolver": {
@@ -7286,6 +7376,16 @@
         "resolve": "^1.14.0"
       },
       "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        },
         "ember-cli-version-checker": {
           "version": "3.1.3",
           "resolved": "https://registry.npmjs.org/ember-cli-version-checker/-/ember-cli-version-checker-3.1.3.tgz",
@@ -7356,6 +7456,16 @@
             "lodash": "^4.17.11"
           }
         },
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        },
         "ember-cli-version-checker": {
           "version": "3.1.3",
           "resolved": "https://registry.npmjs.org/ember-cli-version-checker/-/ember-cli-version-checker-3.1.3.tgz",
@@ -9021,7 +9131,6 @@
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/fs-merger/-/fs-merger-3.0.2.tgz",
       "integrity": "sha512-63wmgjPDClP5XcTSKdIXz66X5paYy/m2Ymq5c5YpGxRQEk1HFZ8rtti3LMNSOSw1ketbBMGbSFFcQeEnpnzDpQ==",
-      "dev": true,
       "requires": {
         "broccoli-node-api": "^1.7.0",
         "broccoli-node-info": "^2.1.0",
@@ -9035,7 +9144,6 @@
           "version": "8.1.0",
           "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
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-          "dev": true,
           "requires": {
             "graceful-fs": "^4.2.0",
             "jsonfile": "^4.0.0",
@@ -9046,7 +9154,6 @@
           "version": "2.0.1",
           "resolved": "https://registry.npmjs.org/fs-tree-diff/-/fs-tree-diff-2.0.1.tgz",
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-          "dev": true,
           "requires": {
             "@types/symlink-or-copy": "^1.2.0",
             "heimdalljs-logger": "^0.1.7",
@@ -9059,7 +9166,6 @@
           "version": "2.0.1",
           "resolved": "https://registry.npmjs.org/matcher-collection/-/matcher-collection-2.0.1.tgz",
           "integrity": "sha512-daE62nS2ZQsDg9raM0IlZzLmI2u+7ZapXBwdoeBUKAYERPDDIc0qNqA8E0Rp2D+gspKR7BgIFP52GeujaGXWeQ==",
-          "dev": true,
           "requires": {
             "@types/minimatch": "^3.0.3",
             "minimatch": "^3.0.2"
@@ -9069,7 +9175,6 @@
           "version": "2.0.2",
           "resolved": "https://registry.npmjs.org/walk-sync/-/walk-sync-2.0.2.tgz",
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-          "dev": true,
           "requires": {
             "@types/minimatch": "^3.0.3",
             "ensure-posix-path": "^1.1.0",
@@ -10023,8 +10128,7 @@
     "graceful-fs": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.3.tgz",
-      "integrity": "sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==",
-      "dev": true
+      "integrity": "sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ=="
     },
     "graceful-readlink": {
       "version": "1.0.1",
@@ -11000,7 +11104,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
       "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
-      "dev": true,
       "requires": {
         "graceful-fs": "^4.1.6"
       }
@@ -13028,6 +13131,18 @@
       "requires": {
         "broccoli-funnel": "^2.0.2",
         "broccoli-merge-trees": "^3.0.1"
+      },
+      "dependencies": {
+        "broccoli-merge-trees": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz",
+          "integrity": "sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==",
+          "dev": true,
+          "requires": {
+            "broccoli-plugin": "^1.3.0",
+            "merge-trees": "^2.0.0"
+          }
+        }
       }
     },
     "randombytes": {
@@ -15280,8 +15395,7 @@
     "universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
-      "dev": true
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
     },
     "unpipe": {
       "version": "1.0.0",
diff --git a/package.json b/package.json
index 18747a9..2ce4db1 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "broccoli-file-creator": "^2.1.1",
-    "broccoli-merge-trees": "^3.0.0",
+    "broccoli-merge-trees": "^4.0.0",
     "ember-cli-babel": "^7.11.1",
     "ember-cli-string-utils": "^1.1.0",
     "ember-macro-helpers": "^4.2.2"